Peterborough needed a stroke of luck to see off a dogged Yeovil side and keep their promotion hopes on course.
A clearance hit Posh striker Craig Mackail-Smith in the face and rebounded for Aaron McLean to shoot home.
Yeovil were generally on the back foot but had their chances, the best coming when Danny Schofield drew a great save from Joe Lewis.
They nearly snatched an equaliser when Craig Morgan cleared Terry Skiverton's close-range effort off the line.
Yeovil: Wagenaar, Alcock (Welsh 85), Skiverton, Owen, Smith (Jones 79), Peltier, Roberts, Way, Schofield, Warne (Downes 62), Noel-Williams. Subs Not Used: Forbes, Murtagh.
Booked: Warne, Peltier, Roberts, Schofield.
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Booked: Keates, Batt.
Goals: Mclean 36.
Att: 4,001
Ref: Chris Sarginson (Staffordshire).
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